2个简单的循环不能协同工作,分段错误

Question

好吧,所以要么我使用FOR或WHILE循环,它们可以单独工作,但是当我在它之后键入相同类型的循环时,它会编译但是在运行之后它会给出错误"seg fault(core dumped)"或者有时候"Bus"错误核心倾销"

我现在正在使用2个2D阵列,我需要制作通用矩阵程序.现在代码是输入.如果我在/*和*/之间添加一个循环,剩下的循环工作正常!

#include <stdio.h>

int main()
{
int i, j, k, l; //I, J for array matrix a, K, L for matrix b
int a[i][j]; //matrix of size i by j
int b[k][l];
int rowa=0, cola=0, rowb=0, colb=0;
//rowa is ROW no. of array a and colb e.g Column no. for array b

printf("size of matrix a: ");
scanf("%d\n%d", &i, &j); //i is row, j is column

printf("size of matrix b: ");
scanf("%d\n%d", &k, &l); //k is row, l is column


while (rowa < i)
{
    while (cola < j)
    {
    statements
    }
statements
}

while (rowb < k)
{
        while (colb < l)
    {
    statements
    }
statements
}

return 0;
}

那我该怎么办？谢谢

Answer 1

您正在使用未初始化的变量,这会导致未定义的行为:

int i, j, k, l; //I, J for array matrix a, K, L for matrix b
int a[i][j]; //matrix of size i by j
...
printf("size of matrix a: ");
scanf("%d\n%d", &i, &j); //i is row, j is column

你应该初始化i和j之前a[i][j]的声明,即

printf("size of matrix a: ");
scanf("%d\n%d", &i, &j);
// initialize the matrix:
int a[i][j];